B&C 8BG51
Thiele-Small parameters
| Nominal size | 8" |
|---|---|
| Impedance | 8 Ω |
| Fs | 52 Hz |
| Qts | 0.4 |
| Qes | 0.42 |
| Qms | 12.3 |
| Vas | 18 L |
| Sd | 220 cm² |
| Xmax | 6.5 mm |
| Re | 5.1 Ω |
| Bl | 11.8 T·m |
| Mms | 35 g |
| Pe | 250 W |
| Sensitivity | 92 dB |
Alignment hint
| EBP | 124 · ported |
|---|---|
| Sealed Vb (Qtc ≈ 0.71) | ≈ 8.5 L |
EBP > 100: favours a ported (bass-reflex) alignment.
Rules of thumb from T/S parameters only. Verify against a real simulation before cutting wood.
Substitute candidates
| Driver | Fs (Hz) | Qts | Vas (L) | Xmax (mm) | Sens (dB) | Fit | Notes | Compare |
|---|---|---|---|---|---|---|---|---|
| B&C 8FG64 | 53 +1 | 0.35 -0.05 | 16.9 -1.1 | 7.5 +1 | 92 = | close | 16 Ω vs 8 Ω: amp load changes | + |
| LaVoce NBASS08-20 | 55 +3 | 0.48 +0.08 | 18.4 +0.4 | 6.5 = | 92 = | close | + | |
| Faital PRO 8RS250 | 56 +4 | 0.32 -0.08 | 18.3 +0.3 | 6.92 +0.42 | 93 +1 | close | + | |
| Faital PRO 8PR200 | 58 +6 | 0.37 -0.03 | 16.9 -1.1 | 8.15 +1.65 | 95 +3 | usable | + | |
| B&C 8FG51 | 49 -3 | 0.32 -0.08 | 20 +2 | 6.5 = | 93 +1 | usable | + | |
| LaVoce FBASS08-18 | 53 +1 | 0.4 = | 23.64 +5.64 | 4.5 -2 | 92.5 +0.5 | usable | 150 W vs 250 W: lower power handling · Xmax 4.5 mm < 6.5 mm: lower excursion-limited SPL | + |
| B&C 8FG64 | 51 -1 | 0.31 -0.09 | 15 -3 | 7 +0.5 | 92 = | usable | + | |
| Sica 8 S 2.5 CP | 54 +2 | 0.33 -0.07 | 18.6 +0.6 | 5 -1.5 | 93 +1 | usable | Xmax 5 mm < 6.5 mm: lower excursion-limited SPL | + |
| Faital PRO 8PR200 | 60 +8 | 0.46 +0.06 | 16.1 -1.9 | 8.65 +2.15 | 94 +2 | usable | 16 Ω vs 8 Ω: amp load changes | + |
| Beyma 8"G40 | 70 +18 | 0.36 -0.04 | 17 -1 | 6.5 = | 95 +3 | usable | + |
Compare the closest 3 against the 8BG51 →
Ranked on parameter similarity only (Qts, Fs, Vas, Xmax, sensitivity). Same nominal size required. A hint, not a simulation, model the swap before cutting or buying.
Used in enclosures (0)
No enclosure in the catalog uses this driver yet.